I converted Breezer uptown 8 to have Banfang Mid drive system. Works well except the assist seems to turn off at higher pedal speeds, not just when bike speed exceeds preset limit which I set at 20 mph. Example in fourth gear assist stops at 13.6 mph. pedal slower assistance comes back on. In fifth gear goes around 14.6 mph and then assist stops. Maybe exceeding motor speed at higher pedal speeds. Any ideas.